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To Home Theater indicates a delay in the

blue channel. But the latter could also be a

result of shortening the leading edge transi-

tions. In any event, I couldn’t identify any

related image degradation or color fringing

artifacts on DVD movies.

You can spend your rainy afternoons

individually optimizing these adjustments for

your DVD collection, or you could try the

default settings that are loaded when you

select one of the predefined Picture modes.

I found all of the default Picture mode set-

tings to be much too aggressive, but you

might want to start with them and use the

Sharpness control to modify the overall pro-

cessing gain. For most of my DVD collec-

tion I ended up setting the Sharpness con-

trol to ‘1’ with very small individual enhance-

ment gain settings, or at zero to bypass the

enhancement. But there were a few DVDs

with rather soft transfers that I used some

additional enhancement to an advantage.

The Luminance and Chrominance

enhancement processing is not available for

analog RGB or DVI signals. For those inputs

a separate Sharpness Filter is added to the

Miscellaneous menu. It has 5 settings (0 to

4) where ‘0’ produces no edge enhancement.

The Delay control in the Chrominance

submenu was not useful. It is intended to

delay the color signals relative to the luma

signal, but it also separated the luma signal

into multiple color components creating an

effect that resembles misconvergence on a

CRT projector. Hence the Delay control should

always be left at its zero (default) position.

Standard-Definition

Scaling

Scaling performance varies depending on

the input signal type and format. The analog

480i YPbPr scaling is excellent. With the

Sharpness control turned off (zero) outlining

around horizontal and vertical edges is only

about 1 to 2 native (720p) pixels, and there

is no additional visible ringing. The 6.75

MHz burst (single-pixel black and white ver-

tical lines) from the AccuPel generator had

negligible bandwidth loss and little aliasing.

Overscan varied between 2 to 2.5 percent

top and bottom, and 3 to 3.5 percent on the

sides. The analog RGB input also accepts

480i signals, but the deinterlacing is poor

(not done by the Faroudja components) and

I wouldn’t recommend using it.

The appearance of 480p YPbPr signals

was not as good. Outlining around horizon-

tal edges was just 1 to 2 pixels, as it was

with 480i signals. But there were 4 to 5

(720p) pixels of outlining on vertical edges

and additional ringing when fed fast signal

transitions from the generator. I don’t

believe this was a scaling effect, but rather

an issue in the analog 480p YPbPr signal

path, because 480p RGB signals looked

very good. The fast signal transitions are

typical of a PC video card. When the AccuPel

generator’s slower edge transition option was

used, the outlining was reduced but still visible.

The top burst in the multiburst pattern

showed only a slight roll-off in frequency

response. Overscan was 3.5 percent on the

sides, and 2.5 percent top and bottom.

The DVI digital video input had no prob-

lem with 480p signals and provided excep-

tionally good scaling with the Sharpness

Filter set to zero. There were only 1 to 2

(720p) pixels of outlining on horizontal and

vertical edges, and all of the bursts in the

multiburst pattern looked excellent. In addi-

tion there was no overscan—not a pixel was

lost at the top, bottom, or sides of the image.

The S-video chroma bandwidth is excel-

lent. The 1.5 MHz chroma stripes on Video

Essentials’ Snell & Wilcox test pattern were

bright, although not equivalent to the fre-

quency response of the YPbPr signals. So

you should still use YPbPr signals from a

DVD player or a digital broadcast receiver

when they are available.

High-Definition Scaling

The projector produces a spatially “pixel

perfect” image when its DVI input is driven

by 720p video signals from an AccuPel

Calibration Generator. Each active (visible)

pixel from the source is mapped to a single

projector pixel. There is not a single pixel of

overscan or underscan. The single pixel

lines within a multiburst pattern are precise-

ly rendered as single pixel lines with full res-

olution. The Sharpness Filter is disabled

when the DVI (or analog RGB) input

receives 720p signals.

The DVI input also worked well for 1080i

digital signals. There were only 1 to 2 pixels

of faint outlining on vertical and horizontal

lines in the Sharpness pattern, with 1 to 2

pixels missing at the edges. However, the

combined effect of the 1080i deinterlacing

(vertical-interpolation) and scaling could be

seen on the overscan patterns, where some

of the horizontal lines were 3 to 4 pixels

thick. The Sharpness Filter had little effect

on the 1080i edges, but it affected the

mulitburst response. The top burst (1920

pixels per picture width) was necessarily

aliased, but the filter rolled off the aliasing

when set below 4. The default (2) setting

was best, below that the frequency

response of the previous burst also began

to roll off.

When the analog YPbPr input is used for

720p signals, the projector scales the

image to create about 1 to 1.5 percent over-

scan on each edge of the screen. The signals

are apparently filtered and produce no visi-

ble lines in the top two bursts of the

AccuPel 720p multiburst pattern, which

means that the horizontal resolution is

below 640 pixels per picture width. There is

also significant outlining (about 6 pixels) on

vertical edges and additional ringing.

Slower edges only slightly reduce the outlin-

ing artifacts. The analog YPbPr input per-

forms similarly with 1080i signals. There are

4 to 5 pixels of outlining, and the overscan

is about 1 percent on each edge. Again

there are no visible lines in the top two

bursts of the multiburst pattern, which

means that the horizontal resolution is

below 960 pixels per picture width.

Because of the poor frequency response, I

would avoid using the YPbPr inputs for

high-definition signals and use the DVI or

RGB input instead.

The analog RGB input does a much bet-

ter job with 720p and 1080i signals. When

the slower AccuPel edge mode is used,

which is equivalent to a high-definition set-

top box, the edge outlining is acceptably

faint. But when the faster edge mode is

used, which is similar to most PC video

cards, the edge outlining was about 8 pix-

els to the right of vertical edges on 720p

signals (5 to 7 pixels on 1080i) and there is

additional ringing. So I would avoid the ana-

log output of unfiltered PC video cards. The

720p single pixel lines in the top burst of

the AccuPel multiburst pattern showed

good resolution and depth of modulation.

The single pixel lines in the 1080i multiburst

were aliased. The Sharpness filter is

enabled for 1080i and the best setting was

the default (2) setting, as it was for 1080i

DVI signals. The Auto Adjust feature worked

well, and produced an image with no over-

scan or missing pixels for 720p. With 1080i

analog signals there was 2 percent top and

bottom overscan, 1 percent right edge, and

none on the left edge.

Deinterlacing

The projector uses Faroudja deinterlac-

ing technology, which includes film-mode

(inverse-telecine) deinterlacing for stan-

dard-definition movies, and DCDi

(Directional Correlational Deinterlacing) pro-

cessing for standard-definition original inter-

laced video.

Inverse-telecine deinterlacing provides

artifact-free deinterlacing of film-source

video as long as the video processor can

lock onto the 2-3 field pulldown cadence

that results from transferring 24 frame-per-

second film to 60 field-per-second inter-

laced video. It also completely eliminates

vertical interpolation in the deinterlacing

process, thereby maintaining the full resolu-

Equipment

Review

Widescreen Review • Issue 84 • May 2004

Page 5/7

#84 Master Pages 26-49 3/22/04 4:32 PM Page 44

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